What are some basic examples of using std::unique_ptr in C++?

Can you explain what std::unique_ptr is in C++?

Sure! std::unique_ptr is a smart pointer in C++ that manages the lifetime of a dynamically allocated object. It ensures that the object is deleted when the unique_ptr goes out of scope.

Can you give me a basic example of how to use std::unique_ptr?

Of course! Here's a simple example:

#include <iostream>
#include <memory>

int main() {
    std::unique_ptr<int> ptr = std::make_unique<int>(10);
    std::cout << *ptr << std::endl; // Outputs: 10
    return 0;
}

What happens if I try to copy a std::unique_ptr?

You cannot copy a std::unique_ptr because it is designed to have a single owner. If you try to copy it, you'll get a compilation error. You can, however, move it using std::move.

Can you show me how to move a std::unique_ptr?

Certainly! Here's an example of moving a std::unique_ptr:

#include <iostream>
#include <memory>

int main() {
    std::unique_ptr<int> ptr1 = std::make_unique<int>(20);
    std::unique_ptr<int> ptr2 = std::move(ptr1);
    if (!ptr1) {
        std::cout << "ptr1 is now null." << std::endl;
    }
    std::cout << *ptr2 << std::endl; // Outputs: 20
    return 0;
}